Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4976
Heron Therapeutics
HRTX
$93.4M
| $129K | ﹤0.01% |
+62,460
| New | +$128K |
|
|
PBT
4977
Permian Basin Royalty Trust
PBT
$1.36B
| $129K | ﹤0.01% |
10,384
-53,295
| -84% | -$567K |
|
4978
CALL
Ring Energy
REI
$307M
| $129K | ﹤0.01% |
163,500
-1,800
| -1% | -$1.52K |
|
4979
CALL
Sana Biotechnology
SANA
$882M
| $129K | ﹤0.01% |
47,600
-78,400
| -62% | -$162K |
|
4980
CALL
ProFrac Holding
ACDC
$653M
| $128K | ﹤0.01% |
16,500
-10,100
| -38% | -$66.1K |
|
4981
CALL
B&G Foods
BGS
$303M
| $128K | ﹤0.01% |
30,400
-1,600
| -5% | -$8.36K |
|
4982
Cracker Barrel
CBRL
$1.26B
| $128K | ﹤0.01% |
2,105
-14,773
| -88% | -$745K |
|
4983
Cricut
CRCT
$1.01B
| $128K | ﹤0.01% |
18,995
+13,095
| +222% | +$74.8K |
|
4984
PUT
Deluxe
DLX
$1.25B
| $128K | ﹤0.01% |
8,100
+5,300
| +189% | +$79.8K |
|
4985
PUT
Fidelity National Financial
FNF
$14.4B
| $128K | ﹤0.01% |
2,300
-10,200
| -82% | -$596K |
|
4986
PUT
First Trust Exchange-Traded Fund VI Multi-Asset Diversified Income Index Fund
MDIV
$431M
| $128K | ﹤0.01% |
2,600
+2,400
| +1,200% | +$37.9K |
|
4987
StoneX
SNEX
$8.72B
| $128K | ﹤0.01% |
3,184
+1,784
| +127% | +$67.1K |
|
|
AZUL
4988
CALL
DELISTED
Azul
AZUL
| $127K | ﹤0.01% |
255,000
+2,300
| +0.9% | +$2.37K |
|
4989
CALL
Genpact
G
$6.22B
| $127K | ﹤0.01% |
2,900
-4,200
| -59% | -$190K |
|
4990
ICL Group
ICL
$6.58B
| $127K | ﹤0.01% |
18,519
-9,265
| -33% | -$60.5K |
|
4991
E.W. Scripps
SSP
$270M
| $127K | ﹤0.01% |
43,529
+30,769
| +241% | +$74.4K |
|
4992
PUT
United Bankshares
UBSI
$6.69B
| $127K | ﹤0.01% |
3,500
-7,300
| -68% | -$256K |
|
4993
CALL
Unisys
UIS
$252M
| $127K | ﹤0.01% |
28,100
+4,200
| +18% | +$18.9K |
|
|
XNET
4994
PUT
Xunlei
XNET
$333M
| $127K | ﹤0.01% |
31,500
-88,900
| -74% | -$412K |
|
|
DAY
4995
CALL
DELISTED
Dayforce
DAY
| $127K | ﹤0.01% |
2,300
-25,600
| -92% | -$1.46M |
|
4996
PUT
Addus HomeCare
ADUS
$2.22B
| $126K | ﹤0.01% |
1,100
| – | – |
|
4997
PUT
Franklin International Core Dividend Tilt Index ETF
DIVI
$2.65B
| $126K | ﹤0.01% |
+2,100
| New | +$71.4K |
|
4998
Dyne Therapeutics
DYN
$4.68B
| $126K | ﹤0.01% |
13,247
+4,452
| +51% | +$49K |
|
|
EU
4999
CALL
enCore Energy
EU
$206M
| $126K | ﹤0.01% |
44,300
-110,500
| -71% | -$199K |
|
5000
PUT
Galectin Therapeutics
GALT
$230M
| $126K | ﹤0.01% |
59,900
+24,500
| +69% | +$36.7K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.